human Cylinder : The deadbolt is thrown and retracted by a positive identification from either cut. As you will not be capable to unlock this from the part without a positive identification, please your local anaesthetic fire code to ensure this is allowed before purchasing. SmartKey : This technology allows you to re-key your embrace in seconds with 3 dim-witted steps and features untainted steel racks, pins, and cut locking bar for increased strength and security.